Amid a growing consensus that the staggering toll of gun violence in the United States is an urgent public health issue, the Johns Hopkins University’s Bloomberg School of Public Health has convened experts on gun policy and violence from the United States and selected other countries to summarize relevant research and its implications for policymakers and concerned citizens. Legal scholars weigh in on the constitutionality of recommended policies, and researchers present new data on public support for a wide array of policies designed to reduce gun violence.